Click on a circle in the diagram to view the category's words and to change the focus of the visualisation. Circle size represents the relative number of words in each category. Orange circles are main categories and grey circles are subcategories. Visualisations can be zoomed in and out by scrolling with a mouse or trackpad. They can also be moved: click, hold and drag any white space in the visualisation and you can move the contents. A [+] sign means that a category has child categories and can be expanded by clicking on it. When all child categories are displayed, the [+] changes to a [-] and clicking on the category will hide the child categories.